I suggest to drop the mesa-libGLw package from the EL 6 repo, as RHEL has a copy of this package since its 6.2 update. http://elgis.argeo.org/repos/testing/6/elgis/SRPMS/mesa-libGLw-6.5.1-9_0.el6.src.rpm http://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/mesa-libGLw-6.5.1-10.el6.src.rpm Volker